I often have conversations with John over _____telephone, while I keep in touchwith Tom by _____letter.
I _____ you yesterday, but you weren’t in.
—I usually go there by train.—How about _____ by boat this time?
—Shall I stop here?—No.Go on _____ ,please.
Do you remember _____ Mr.Smith at the meeting last Saturday?
I don't feel like _____ tonight as I'm so tired.